Retaining ring



FIG. 1 is a perspective view of a retaining ring according to this invention;

FIG. 2 is a top view thereof;

FIG. 3 is an edge view thereof;

FIG. 4 is a view from the opposite edge;

FIG. 5 is an edge view of the retaining ring illustrated in FIG. 6;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is an opposite edge view of the retaining ring illustrated in FIG. 6. 

The ornamental design for a retaining ring, as shown and described. 